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christopher
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Join Date: Nov 2009
Posts: 15

Waukesha Engine Giving Detonating Sound.

01/16/2013 8:32 AM

hello everyone,

i am a maintenance personel working on a waukesha gas engine.one of our engines gives a detonating sound when fired and then trips.please what can i do to fix this problem... thanks
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lyn
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#1

Re: waukesha engine giving detonating sound.

01/16/2013 8:35 AM

Call someone who can fix it.

What do you mean, trips? The engine trips?

If you don't know enough about the engine to describe the problem, it's doubtful that anybody will be able to give you step-by-step directions to trouble shoot and fix it.

Call a service tech.

Ask a Waukesha Technician
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christopher
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#6
In reply to #1

Re: waukesha engine giving detonating sound.

01/17/2013 5:29 AM

*laughs*...anyways thanks for responding
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PWSlack
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#2

Re: waukesha engine giving detonating sound.

01/16/2013 8:50 AM

<...detonating sound...>

Has one of the pistons appeared outside the crankcase, perhaps?

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christopher
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Join Date: Nov 2009
Posts: 15
#8
In reply to #2

Re: waukesha engine giving detonating sound.

01/17/2013 5:32 AM

not at all,piston still very intack. thanks
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Mian Waqar
Participant

Join Date: Jan 2013
Posts: 1
#3

Re: Waukesha Engine Giving Detonating Sound.

01/16/2013 1:14 PM

Do boroscopic inspection(inspect the intake and exhaust valve).Also repalce the spark plugs with new one
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christopher
Active Contributor

Join Date: Nov 2009
Posts: 15
#5
In reply to #3

Re: Waukesha Engine Giving Detonating Sound.

01/17/2013 5:28 AM

thank so much man waqar.....we have actually changed the spark plugs,also we calibrated the in take gas pressure to spec...the unit is now up and running.
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Doorman
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#4

Re: Waukesha Engine Giving Detonating Sound.

01/16/2013 2:29 PM

Detonating sound... Hmmmm

This isn't a hit-and-miss engine, is it? Come on...

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christopher
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Join Date: Nov 2009
Posts: 15
#7
In reply to #4

Re: Waukesha Engine Giving Detonating Sound.

01/17/2013 5:31 AM

no, its no hit and run.....this is a serious issue and not a joke....thanks for responding however ur contribution turned out to be.
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Dennis WEHS
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Join Date: Jan 2013
Location: Waukesha, WI
Posts: 5
#9

Re: Waukesha Engine Giving Detonating Sound.

01/17/2013 11:03 AM

What Waukesha engine model are you dealing with? What do you mean 'trips'? Does this engine have an electronic detonation sensing module like Waukesha's ESM or DSM?
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christopher
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Posts: 15
#15
In reply to #9

Re: Waukesha Engine Giving Detonating Sound.

01/18/2013 5:12 AM

by trip i meant shutdown. it has CEC {CUSTOM ENGINE CONTROL} model no L5108cst
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Dennis WEHS
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Join Date: Jan 2013
Location: Waukesha, WI
Posts: 5
#16
In reply to #15

Re: Waukesha Engine Giving Detonating Sound.

01/18/2013 10:59 AM

Do you mean L5108GSI? They don't make a cst version.
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christopher
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Posts: 15
#17
In reply to #16

Re: Waukesha Engine Giving Detonating Sound.

01/19/2013 4:27 AM

yes i meant L5108GSI...SORRY FOR THE MIx UP.please if u can also furnish me with operation and maintenance manual i would be grateful
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Dennis WEHS
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Join Date: Jan 2013
Location: Waukesha, WI
Posts: 5
#18
In reply to #17

Re: Waukesha Engine Giving Detonating Sound.

01/20/2013 11:29 AM

Since that engine model is a relatively recent model you will have to ask your local GE Waueksha gas engine distributor for one. See:

http://site.ge-energy.com/corporate/waukesha-services/index.html
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khairy Aish
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Location: Egyptian in Saudi Aarabia
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#10

Re: Waukesha Engine Giving Detonating Sound.

01/17/2013 2:07 PM

Causes of pre-ignition

Carbon deposits form a heat barrier and can be a contributing factor to pre-ignition. Other causes include: An overheated spark plug (too hot a heat range for the application). Glowing carbon deposits on a hot exhaust valve (which may mean the valve is running too hot because of poor seating, a weak valve spring or insufficient valve lash).

  • A sharp edge in the combustion chamber or on top of a piston (rounding sharp edges with a grinder can eliminate this cause).
  • Sharp edges on valves that were reground improperly (not enough margin left on the edges).
  • A lean fuel mixture.
  • An engine that is running hotter than normal due to a cooling system problem (low coolant level, slipping fan clutch, inoperative electric cooling fan or other cooling system problem).
  • Auto-ignition of engine oil droplets
  • Not putting oil in the engine

For more details continue here http://en.wikipedia.org/wiki/Engine_knocking

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Dennis WEHS
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Join Date: Jan 2013
Location: Waukesha, WI
Posts: 5
#11
In reply to #10

Re: Waukesha Engine Giving Detonating Sound.

01/17/2013 3:10 PM

add timing to that list
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christopher
Active Contributor

Join Date: Nov 2009
Posts: 15
#14
In reply to #10

Re: Waukesha Engine Giving Detonating Sound.

01/18/2013 5:01 AM

dear khairy aish,

though we were able to trouble shoot and bring back the unit into operation, but i must say u are a genius, because some of the factors you listed here were actually rectified and the problem was solved afterwards.the gate valves were changed{left and right banks}, the spark plugs too were changed and some regapped.the fuel regulator was recalibrated to spec of 5inches of water....amongst other corrective measures.thanks once again for your valuable contribution .....regards
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Dennis WEHS
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Join Date: Jan 2013
Location: Waukesha, WI
Posts: 5
#12

Re: Waukesha Engine Giving Detonating Sound.

01/17/2013 5:39 PM

Waukesha makes lean burn and stoichiometric engines. Which is this?
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ducon
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#13

Re: Waukesha Engine Giving Detonating Sound.

01/18/2013 1:42 AM

WHY ASK US? Call Waukesha !!!!

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Users who posted comments:

christopher (7); Dennis WEHS (5); Doorman (1); ducon (1); khairy Aish (1); lyn (1); Mian Waqar (1); PWSlack (1)

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